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This is Dr. David
I can understand your worries about this 19 year old influencing your 15 year old
are you the head of your household?
how does the 19 year old know the 15 year old if he is from out of state? from the internet?
are you the guardian of the 15 year old?
if he is not a relative of yours, he should not be able to enter your home if you do not give him permission to enter your home.